One of Vice President Joe Biden's closest advisers is encouraging Biden's former Senate, White House and campaign aides that they should not count him out of the 2016 White House race just yet.

"He believes we must win this election," Kaufman said. "Everything he and the president have worked for — and care about — is at stake."

The memo from Biden's former chief of staff Ted Kaufman told "Biden alumni" that Biden has a plan for winning the nomination, and that the vice president's team has been screening potential campaign staffers for months now.

"I am confident that the Vice President is aware of the practical demands of making a final decision soon," Kaufman wrote in an email immediately after the Democratic debate. "If he decides to run, we will need each and every one of you — yesterday!"

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